What is the abbreviation for "milliliter"?

The abbreviation for "milliliter" is "ml," which is the correct answer. This abbreviation is widely recognized in medical and pharmacological contexts, where precise measurements of liquid volume are essential. A milliliter is equal to one-thousandth of a liter, and it is commonly used to measure the volume of medications, particularly in liquid form. Understanding these abbreviations is crucial for medication administration and ensuring accurate dosing in patient care settings.

The other provided choices represent different units of measurement. "gm" stands for grams, which measures mass rather than volume, while "mcg" refers to micrograms, another mass measurement, and "Gr" indicates grains, an older measurement unit that is also not used for volume. Thus, "ml" stands distinctly as the correct abbreviation for milliliters, emphasizing the importance of clear communication within healthcare environments.